CN-120292749-B - Heat pump control method and system for tower water heat recovery heating based on digital twin

CN120292749BCN 120292749 BCN120292749 BCN 120292749BCN-120292749-B

Abstract

The invention discloses a heat pump control method and a heat pump control system based on digital twin tower water heat recovery heating, wherein a magnetic suspension heat pump absorbs heat from a tower water system and a circulating water side in a production line through an evaporator, releases heat through a condenser and a plate exchanger and heats a water tank, and the heat pump control method further comprises the following steps of enabling the tower water heat recovery system to transfer heat in a set temperature range of a tower water heating scheme through a magnetic suspension heat pump unit running in a waste heat recovery process of a multi-working-condition tower water circulation system; the method comprises the steps of collecting operation data of the magnetic suspension heat pump unit in real time, constructing a dynamic simulation model synchronously mapped by the magnetic suspension heat pump unit based on a parameterized model of the magnetic suspension heat pump unit structure, carrying out thermodynamic simulation on a tower water heating scheme under multiple working conditions based on a digital twin model in a heat absorption and heat release process of the magnetic suspension heat pump unit, simulating a waste heat recovery process of a tower water circulation system, and dynamically adjusting power and board replacement parameters of a compressor and feeding back the power and board replacement parameters to the magnetic suspension heat pump unit by calculating heat transfer efficiency under different working conditions.

Inventors

WU YANGUANG
ZHANG BIAO
HU BAIHE
GOU JUN
LIANG ZHEN
ZHENG XIAOJUAN
Zhang Shenyin
LIU QINGHUA

Assignees

雷茨智能装备(广东)有限公司

Dates

Publication Date: 20260512
Application Date: 20250512

Claims (5)

1. The heat pump control method based on digital twin tower water heat recovery heating is characterized in that the magnetic suspension heat pump absorbs heat from the circulating water side in a tower water system and a production line through an evaporator, releases heat to heat a water tank through a condenser and plate exchange, and further comprises the following steps: The magnetic suspension heat pump unit is operated in the waste heat recovery process of the multi-working-condition tower water circulation system, so that the heat of the tower water heat recovery system is transferred within the set temperature range of the tower water heating scheme; Collecting operation data of the magnetic suspension heat pump unit in real time, and constructing a dynamic simulation model of synchronous mapping of the magnetic suspension heat pump unit based on a parameterized model of the magnetic suspension heat pump unit structure; Acquiring operation data of the magnetic suspension heat pump unit in real time through a sensor, wherein the operation data comprise temperatures of an evaporator and a condenser, power of a magnetic suspension compressor and circulating flow of tower water, constructing a three-dimensional model of the magnetic suspension heat pump unit based on a parameterized model of the magnetic suspension heat pump unit structure by adopting a BIM technology, simulating heat transfer processes under winter working conditions and summer working conditions according to the heating requirement of the tower water temperature, and constructing a three-dimensional dynamic simulation model of synchronous mapping of the magnetic suspension heat pump unit; The construction of the three-dimensional model of the magnetic suspension heat pump unit by adopting the BIM technology comprises the following steps: Labeling a set heating range of the temperatures of the evaporator and the condenser, a rotating speed power curve of the compressor and a plate change heat transfer coefficient on the three-dimensional dynamic simulation model; the set temperature rise ranges for the evaporator and condenser temperatures include: according to the working condition in winter, the evaporator side absorbs the first temperature of the circulating water, the power of the compressor is regulated according to the heating requirement of the tower water temperature, and the condenser regulates the circulating water in the absorption water tank replaced by the heating plate to the second preset temperature; According to the second temperature of the circulating water absorbed by the side of the evaporator in summer working conditions, the power of the compressor is regulated according to the heating requirement of the temperature of the tower water, and the condenser regulates the circulating water in the absorption water tank replaced by the heating plate to a second preset temperature; the compressor speed power curve includes a mathematical relationship of compressor speed Vt to compressor power P: P=a*Vt 2 +b*Vt+c The power curve coefficients of the rotating speeds and the power of the compressors a, b and c can be obtained by measuring the power at different rotating speeds and using least square fitting; Correcting coefficients a, b and c according to the compressor data detected by the real-time sensor, predicting COP at different speeds through fitting a compressor speed power curve, and correcting the compressor speed power curve coefficient by comparing a predicted value of the compressor speed power curve with actual sensor data; the plate heat transfer coefficient includes: by constructing a dynamic plate change heat transfer model: ; Wherein, the For the real-time heat transfer coefficient, For the initial heat transfer coefficient, For the cleaning factor, the cleaning factor is affected by dirt on the surface of the board, For the real-time flow rate of the circulating water, For the rated flow rate of plate change, n is the heat transfer coefficient of the flow rate, and n is 0.5< 1; returning the dirt thickness on the surface of the plate change through the sensor, adjusting the coefficient of the cleaning factor, comparing the predicted value of the dynamic plate change heat transfer model with actual sensor data, and correcting the heat transfer coefficient; Carrying out thermodynamic simulation on a multi-working-condition tower water heating scheme based on a digital twin model for the heat absorption and release process of the magnetic suspension heat pump, and simulating the waste heat recovery process of a tower water circulation system; calculating the heat absorption quantity of the evaporator side and the heat release quantity of the condenser side according to the temperature of the evaporator side, the first preset temperature of the condenser side and the heating requirement of the tower water temperature under the working conditions of winter and summer, and establishing an inverse Carnot cycle dynamic equation and a COP prediction model; the heat transfer efficiency under different working conditions is calculated, the power of the compressor and the plate change parameters are dynamically adjusted, and the heat transfer efficiency is fed back to the magnetic suspension heat pump unit; according to the operation data of the magnetic suspension heat pump unit, according to the tower water temperature heating requirement, predicting the power of the compressor under different working conditions, and passing through an inverse Carnot circulation equation and a heat transfer equation; ; Wherein, the For the heat absorption of the evaporator, m is the circulating water flow, c is the specific heat capacity of the circulating water, The temperature difference of tower water at the inlet and outlet of the evaporator side is; for the heat release of the condenser, For the dynamic heat transfer coefficient, Is the logarithmic average temperature difference; COP is the system energy efficiency ratio, W is compressor power, and H is heat transfer efficiency.
2. The heat pump control method based on digital twin tower water heat recovery heating according to claim 1, wherein the magnetic suspension heat pump unit operating in the waste heat recovery process of the multi-working-condition tower water circulation system comprises: The magnetic suspension heat pump unit is provided with a low-temperature heat absorption side, a high-temperature heat emission side and a magnetic suspension centrifugal compressor, wherein the low-temperature heat absorption side absorbs heat in an evaporator, a refrigerant is evaporated into refrigerant gas after passing through the heat of circulating water in an absorption tower water system and a production line, the refrigerant gas is subjected to work by the high-temperature magnetic suspension centrifugal compressor, the high-temperature heat absorption side emits heat in a condenser, and the condenser releases heat in a condensing mode from the high-temperature high-pressure refrigerant gas; The magnetic suspension heat pump unit changes and adjusts the heat released by the condenser through the heating plate, and discharges the heated circulating water into the tower water tank.
3. The heat pump control method based on digital twin tower water heat recovery heating according to claim 2, wherein the magnetic suspension heat pump unit operating in the waste heat recovery process of the multi-working-condition tower water circulation system further comprises: The working condition in winter is that the evaporator side of the magnetic suspension centrifugal compressor absorbs the first temperature of circulating water, the first temperature of the circulating water is utilized to do work through the high-temperature magnetic suspension centrifugal compressor, the condenser compresses refrigerant gas and releases heat, the heat released by the condenser is exchanged and regulated through a heating plate, the circulating water is heated to a first preset temperature and is discharged into a tower water tank, and the water temperature of the tower water tank is raised; the working condition in summer is that the evaporator side of the magnetic suspension centrifugal compressor absorbs the second temperature of circulating water, the second temperature of the circulating water is utilized to do work through the high-temperature magnetic suspension centrifugal compressor, the condenser compresses refrigerant gas and releases heat, the heat released by the condenser is exchanged and regulated through a heating plate, the circulating water is heated to a first preset temperature and is discharged into a tower water tank, and the water temperature of the tower water tank is raised; and (3) adjusting working conditions, namely changing the third temperature of the circulating water in the absorption water tank by the heating plate, changing the heat of the circulating water heated to the first preset temperature, adjusting the circulating water in the absorption water tank by the heating plate to the second preset temperature, absorbing the fourth temperature of the circulating water by the condenser side of the magnetic suspension centrifugal compressor, and releasing heat after compressing to the preset temperature.
4. A heat pump control method based on digital twin column water heat recovery heating according to claim 3, wherein dynamically adjusting the compressor power and plate change parameters by calculating heat transfer efficiency under different conditions comprises: Based on the PID controller, the power of the compressor is dynamically adjusted, and the rotating speed of the compressor is adjusted according to the deviation between the set value of the tower water temperature and the actual value.
5. A heat pump control system based on digital twin tower water heat recovery heating, characterized by comprising a heat pump control method based on digital twin tower water heat recovery heating according to any one of claims 1-4, further comprising the steps of: The data acquisition module is a magnetic suspension heat pump unit which operates in the waste heat recovery process of the multi-working-condition tower water circulation system, so that the tower water heat recovery system transfers heat within a set temperature range of a tower water heating scheme; The digital twin model is used for collecting the operation data of the magnetic suspension heat pump unit in real time and constructing a dynamic simulation model synchronously mapped by the magnetic suspension heat pump unit based on the magnetic suspension heat pump unit structure parameterized model; Carrying out thermodynamic simulation on a multi-working-condition tower water heating scheme based on a digital twin model for the heat absorption and release process of the magnetic suspension heat pump, and simulating the waste heat recovery process of a tower water circulation system; And the data feedback module is used for dynamically adjusting the power of the compressor and the plate change parameters by calculating the heat transfer efficiency under different working conditions and feeding back the heat transfer efficiency to the magnetic suspension heat pump unit.

Description

Heat pump control method and system for tower water heat recovery heating based on digital twin Technical Field The invention relates to the technical field of tower water waste heat recovery, in particular to a heat pump control method and a heat pump control system for tower water heat recovery heating based on digital twinning. Background In the prior art, the tower water heating mainly relies on a direct steam heating or electric heating mode, and the basic principle is that the heat of high-temperature steam is transferred to circulating water through a steam heat exchanger so as to realize water temperature improvement. The steam heating consumes a large amount of fuel to generate high-temperature steam, has low energy conversion efficiency and has heat loss in the steam conveying process. The steam heating temperature control relies on manual regulation valve aperture, and in addition, the electrical heating mode electric energy consumption is huge, and running cost is high, is difficult to satisfy green low carbon's production demand. In recent years, heat pump technology has been increasingly applied to industrial waste heat recovery. The existing heat pump increases the temperature of a low-temperature heat source through a compressor, after the plate heat exchanger runs for a long time, the heat transfer coefficient is reduced due to accumulation of surface dirt, and the energy efficiency is gradually deteriorated due to lack of a dynamic correction mechanism. Disclosure of Invention In order to overcome the above disadvantages of the prior art, the present invention is directed to a heat pump control method for digitally twin-based tower water heat recovery heating, so as to solve the problems set forth in the above background art. The technical scheme adopted for solving the technical problems is that the heat pump control method based on digital twin tower water heat recovery heating is that the magnetic suspension heat pump absorbs heat from a tower water system and a circulating water side in a production line through an evaporator and releases the heat to a heat tank through a condenser and a plate, and the method further comprises the following steps: The magnetic suspension heat pump unit is operated in the waste heat recovery process of the multi-working-condition tower water circulation system, so that the heat of the tower water heat recovery system is transferred within the set temperature range of the tower water heating scheme; Collecting operation data of the magnetic suspension heat pump unit in real time, and constructing a dynamic simulation model of synchronous mapping of the magnetic suspension heat pump unit based on a parameterized model of the magnetic suspension heat pump unit structure; Carrying out thermodynamic simulation on a multi-working-condition tower water heating scheme based on a digital twin model for the heat absorption and release process of the magnetic suspension heat pump, and simulating the waste heat recovery process of a tower water circulation system; And the heat transfer efficiency under different working conditions is calculated, the power of the compressor and the plate change parameters are dynamically adjusted, and the heat transfer efficiency is fed back to the magnetic suspension heat pump unit. As a further improvement of the invention, the magnetic suspension heat pump unit running in the waste heat recovery process of the multi-working-condition tower water circulation system comprises: The magnetic suspension heat pump unit is provided with a low-temperature heat absorption side, a high-temperature heat emission side and a magnetic suspension centrifugal compressor, wherein the low-temperature heat absorption side absorbs heat in an evaporator, a refrigerant is evaporated into refrigerant gas after passing through the heat of circulating water in an absorption tower water system and a production line, the refrigerant gas is subjected to work by the high-temperature magnetic suspension centrifugal compressor, the high-temperature heat absorption side emits heat in a condenser, and the condenser releases heat in a condensing mode from the high-temperature high-pressure refrigerant gas; The magnetic suspension heat pump unit changes and adjusts the heat released by the condenser through the heating plate, and discharges the heated circulating water into the tower water tank. As a further improvement of the invention, the magnetic suspension heat pump unit running in the waste heat recovery process of the multi-working-condition tower water circulation system further comprises: The working condition in winter is that the evaporator side of the magnetic suspension centrifugal compressor absorbs the first temperature of circulating water, the first temperature of the circulating water is utilized to do work through the high-temperature magnetic suspension centrifugal compressor, the condenser compresses refrigerant gas and releases heat, the heat